/* taken from linux, and modified by zhenwei pi */
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
 */

#ifndef _LINUX_NVME_RDMA_H
#define _LINUX_NVME_RDMA_H

#define NVME_RDMA_MAX_QUEUE_SIZE 128

enum nvme_rdma_cm_fmt {
    NVME_RDMA_CM_FMT_1_0 = 0x0,
};

enum nvme_rdma_cm_status {
    NVME_RDMA_CM_INVALID_LEN = 0x01,
    NVME_RDMA_CM_INVALID_RECFMT = 0x02,
    NVME_RDMA_CM_INVALID_QID = 0x03,
    NVME_RDMA_CM_INVALID_HSQSIZE = 0x04,
    NVME_RDMA_CM_INVALID_HRQSIZE = 0x05,
    NVME_RDMA_CM_NO_RSC = 0x06,
    NVME_RDMA_CM_INVALID_IRD = 0x07,
    NVME_RDMA_CM_INVALID_ORD = 0x08,
};

static inline const char *nvme_rdma_cm_msg(enum nvme_rdma_cm_status status)
{
    switch (status) {
    case NVME_RDMA_CM_INVALID_LEN:
        return "invalid length";
    case NVME_RDMA_CM_INVALID_RECFMT:
        return "invalid record format";
    case NVME_RDMA_CM_INVALID_QID:
        return "invalid queue ID";
    case NVME_RDMA_CM_INVALID_HSQSIZE:
        return "invalid host SQ size";
    case NVME_RDMA_CM_INVALID_HRQSIZE:
        return "invalid host RQ size";
    case NVME_RDMA_CM_NO_RSC:
        return "resource not found";
    case NVME_RDMA_CM_INVALID_IRD:
        return "invalid IRD";
    case NVME_RDMA_CM_INVALID_ORD:
        return "Invalid ORD";
    default:
        return "unrecognized reason";
    }
}

/**
 * struct nvme_rdma_cm_req - rdma connect request
 *
 * @recfmt:        format of the RDMA Private Data
 * @qid:           queue Identifier for the Admin or I/O Queue
 * @hrqsize:       host receive queue size to be created
 * @hsqsize:       host send queue size to be created
 */
struct nvme_rdma_cm_req {
    __le16 recfmt;
    __le16 qid;
    __le16 hrqsize;
    __le16 hsqsize;
    __u8 rsvd[24];
};

/**
 * struct nvme_rdma_cm_rep - rdma connect reply
 *
 * @recfmt:        format of the RDMA Private Data
 * @crqsize:       controller receive queue size
 */
struct nvme_rdma_cm_rep {
    __le16 recfmt;
    __le16 crqsize;
    __u8 rsvd[28];
};

/**
 * struct nvme_rdma_cm_rej - rdma connect reject
 *
 * @recfmt:        format of the RDMA Private Data
 * @sts:           error status for the associated connect request
 */
struct nvme_rdma_cm_rej {
    __le16 recfmt;
    __le16 sts;
};

#endif /* _LINUX_NVME_RDMA_H */
